Machine for rebabbitting bearings



March 1, 1932. STAFF 1,847,789

MACHINE FOR REBABBITTING BEARINGS Filed Aug. 2, 1930 2 Sheets-Sheet 1 iL well did p March 1, 1932. STAFF 1,847,789

MACHINE FOR REBABBITTING BEARINGS Filed Aug. 2, 1950 2 Sheets-Sheet 2 gA will x WN i I 0 zowez, Jill/(f.

Patented Mar. 1, 1932 PATENT ()FFICE LOWELL STAFF, F AMARILLO, TEXASMACHINE FOR REBABBITTING BEARINGS Application filed August 2, 1930.Serial No. 472,711.

This invention has for its principal object the provision of simple,efficient and easily manipulated means whereby the rebabbitting ofconnecting rods and other bearings may be expeditiously accomplished.The invention seeks to provide a mechanism which may be easily operatedby a single workman and by the use of which the bushing of Babbitt metalin the bearing or connecting rods and other devices may be renewed withminimum labor and at a low cost. The invention is illustrated in theaccompanying drawings and will be hereinafter fully set forth.

In the drawings:

Figure 1 is a perspective view of an apparatus embodying the invention,

Fig. 2 is a central vertical section of the same,

Fig. 3 is a rear elevation,

Fig. 4 is a horizontal section on the line 44 of Fig. 2, and

Fig. 5 is a detail section through a portion of a connecting rod showinga new bushing therein.

In carrying out the present invention, there is provided a base plate orstandard 1 havlng a lateral flange 2 at its lower end through whichbolts or other fastening devices may be inserted into a workbench orother fixed 30 support, indicated at 3. to secure the base member firmlyin operative position. The lateral flange or foot 2 and the standard arereinforced by webs 4 cast integral therewith at the angles formedthereby, as shown and as will be understood. The standard 1 is providedwith an opening, indicated at 5, therethrough and above and below saidopening on the vertical diameter of the same, vertical slots 6 areformed through the standard. as clearly shown in Fig. 2. Secured to theface of the standard 1 by cap screws or bolts, indicated at 7, is a coreplate 8 which above and below its center has Vertical slots 9 formedtherethrough which slots are alined with the slots 6 in the standard fora purpose which will presently appear. The core plate is provided at itscenter on its outer side with a core 10, preferably of semi-circularsectional contour and having a radius corresponding to the radius of thebushing which is to be formed, it being understood that in actualpractice a variety of the core plates may be provided forinterchangeable use and they may be very easily and rapidly mounted onthe supporting standard by merely removing and then reinserting the capscrews or bolts 7. The core 10 is formed on opposite sides withprojections 11 which will produce small recesses in the edges of thebushing, the bushing being indicated at 12 in Fig. 5, and the recessesat 13 in said figure. Bosses or studs 14 are also formed on the face ofthe core plate adjacent and at opposite sides of the core 10 and thesestuds or bosses 14 are so disposed that they will engage in the openingsprovided for securing bolts in the attaching lugs or flanges of theconnecting rods or half bearings in which the bushing is to be formed.Above and below the core 10, jaws 15 and 16 are slidably mounted uponthe face of the core plate, each jaw having a basal member 17 preferablyin the form of a flat plate having its side edges disposed adjacent andin sliding engagement with vertical ribs 18 formed on the face of thecore plate. as clearly shown in Figs. 1 and 4. Upon the outer side ofeach guide rib 18, a flange 19 is secured by the cap screws or bolts 7.the several flanges being so disposed that they will project inwardlybeyond the respective ribs and 8 overlap the adjacent side portions ofthe respective basal members 17, the side edges of said basal membersbeing rabbeted to accommodate the overlapping edges of the guideflanges. as will be understood upon reference to Fig. 1. The lower jaw16 projects outwardly from the corresponding base member 17 in asemi-circular form and in its upper surface is formed with a recess 20whereby it may fit about the lower end of the core 10. as shown in Fig.2, and above said recess 20 it is formed with a second upper concentricledge 21 which will be disposed in front of the core when the device isin use and will define a second upper recess in which the lower portionof the bushing may flow and be cast. The upper jaw 15 also has asemi-circular portion projecting from the face of the base member 17 butthe lower side of the jaw 15 is fiat and in one plane so that it mayrest on the upper end of the core 10, as shown in Fig. 2. The upper jaw,however, does have a depending rib or flange 22 at its margin which,when the device is in operative position, will be disposed in front ofthe core 10 concentric therewith but spaced therefrom, and through theupper portion of the jaw 15 is formed a pouring opening 23 which leadsdirectly into the space 24 between the rib 22 and the core 10, as shown.

Secured in the opening 5 of the main support 1 is a stud or pivot post25 which projects from the back of the standard, as shown clearly inFigs. 2 and 4:, and upon this stud or post is rotatably mounted a camplate 26 in which are upper and lower oppositely disposed eccentricarcuate slots 27, the cam plate being provided upon its periphery with aradial projection or handle member 28 to which may be attached a leverextension or a connection whereby the cam plate may be operativelycoupled with a treadle or other operating device. The cam plate isretained in position on the post 25 close against the back of thestandard 1 by any convenient means, such as acotter pin indicated at 29,and the eccentric slots 27 receive the rear ends of studs or pins 30which are firmly secured in the aws 15 and 16 and project rearwardlytherefrom through the vertical slots 9 and 6 in the core plate and thestandard, respectively, as shown clearly in Fig. 2. It will now beunderstood that if the cam plate 26 be rotated about the post 25 thestuds or pins 30 will be moved radially with respect to the post 25 sothat they will shift toward or from each other and, consequently, willmove the aws 15 and 16 into or out of operative relation to the core 10.

To illustrate the use of the device, a portion of a connecting rod isshown at 31, it being noted that a half bearing 32 is formed at the endof the rod which half bearing is provided at diametrically oppositepoints with lugs having openings 33 therethrough through which andcorresponding openings on the mating half bearing fastening bolts areinserted to secure the bearing members about a crank or wrist pin. henthe bushing with which the bearings are provided becomes worn so thatthe parts do not operate in proper alinement, the old bushing may beground out from the bearings and the bearing which is to be rebabbittedthen disposed between the jaws 15 and 16 with the openings 33 receivingthe studs 14c, as shown in 1. The half bearing will thus be disposedconcentric with the core 10 on the core plate and in spaced relation tothe same, after which the cam plate is rocked so as to bring the jaws 15and 16 into engagementwith the top and bottom of the bearingrcspect-ively, as shown in Fig. 2. This shifting of the aws will bringthe ledge 21 directly under the lower end of the bearing while thepouring opening 23, 24 will be directly over and in communication withthe space between the core and the bearing, also as shown in Fig. 2. Themolten Babbitt metal may then be poured through the pouring opening 23by a ladle or, as is preferred, through a pouring pipe which iscontrolled by a cut-off valve and is disposed in proximity to the jaw.The metal will flow into and entirely fill the space between the halfbearing and the core and will project beyond the top and bottom of thebearing into the space 24 and the space defined by the ledge 21 formingprojecting flanges 34, as shown in Fig. 5. The Babbitt metal will alsoflow through the openings 35 in the half bearing and form keys or plugsfilling said openings whereby the bushing will be firmly anchored in thehearing. The jaws are then moved apart by manipulation of the cam plateand the bearing with the bushing therein is withdrawn so that thebushing may be subsequently finished in a boring machine.

Upon reference to Fig. 3, it will be understood that downward movementof the projection 28 will result in movement of the pins 30 from eachother so that the clampmg aws will be separated. In actual practice, atreadle below the workbench is connected with the projection by a rigidconnecting rod or link, and a spring is connected to the treadle in suchmanner as to urge the same upward and move the jaws 1to work-clampingposition. The workman thus has his hands free to remove a connecting rodor hearing or to insert one while manipulating the treadle by footpressure, and the bearing will be held automatically through the actionof the spring while the poured metal is cooling. This treadle and springarrangement is common shop prac tice and illustration thereof is deemedunnecessary.

From the foregoing description, taken in connection with theaccompanying drawings, it will be seen that I have provided anexceedingly simple apparatus whereby rebabbitting of bearings may berapidly, accurately and easily accomplished.

Having thus described the invention, I claim: I

1. A rebabbitting mechanism comprising a support, a core plate rigidlysecured upon one side of the support and having a central core on itsouter face, jaws slidably mounted on the core plate above and below thecore to cooperate therewith, the upper jaw having a pouring openingtherein through which molten metal may be poured to fill the spacebetween the core, the jaws and a bearing clamped by and between thejaws, a cam plate mounted on the back of the support parallel with thecore plate, and means on the jaws engaging the cam plate whereby saidcam plate will move the jaws toward and from each other.

2. A rebabbitting mechanism comprising a support, a core plate securedupon the face of the support and having a core formed on its outer side,jaws mounted slidably on the core plate above and below the core tocooperate therewith in forming a mold in which a bushing may be poured,the core plate and the support having alined vertical slots formedtherethrough, a cam plate rotatably mounted on the back of the supportand provided with upper and lower eccentrically disposed arcuate slots,and studs projecting rearwardly from the respective jaws through theslots in the core plate and the support and engaging in the eccentricslots in the cam plate.

In testimony whereof I aflix my signature. 2o LOWELL STAFF. [11. s.]

